Failed to start ReadyNAS System Daemon.

I solved the problem myself )))

In my case it was the following:

-- Unit readynasd.service has begun starting up.
Apr 04 16:31:01 Beta readynasd[8156]: readynasd log started
Apr 04 16:31:01 Beta readynasd[8156]: readynasd started. (restarted=0)
Apr 04 16:31:01 Beta readynasd[8156]: DB (main) schema version: 24 ==> 24
Apr 04 16:31:01 Beta readynasd[8156]: DB (queue) schema version: new ==> 0
Apr 04 16:31:01 Beta readynasd[8156]: Failed to INSERT INTO service_cifs
Apr 04 16:31:01 Beta readynasd[8156]: rndb_import() ==> 1 (156ms)
Apr 04 16:31:01 Beta readynasd[8156]: Error rndb_import() ==> rc=1
Apr 04 16:31:01 Beta readynasd[8156]: dba import failed
Apr 04 16:31:01 Beta systemd[1]: readynasd.service: Main process exited, code=exited, status=255/n/a
Apr 04 16:31:01 Beta systemd[1]: Failed to start ReadyNAS System Daemon.
-- Subject: Unit readynasd.service has failed

And /etc/default/services was null size

root@Beta:/etc/default# ls -l
total 96
-rw-r--r-- 1 admin admin 0 Apr 4 11:24 services

Replace /etc/default/services by /etc/default/config/etc/default/services

cd /etc/default
rm services
cp /etc/default/config/etc/default/services /etc/default